I bought a Oberheim OBXA 4 voice before I know they came in different versions. Now I am dissapointed because it sounds nothing as lush as the one I heard online. So does anyone know where to get extra cards or how much they run?

So the voices correspond to how many notes can be played at once? I am playing a triad and the bass note doubled like Cmin triad with 2 Cs in the base I need 5 voices? how does the voices apply when playing in unison mode?

You got it, each voice card equals a note. Unison makes all the voices play for one note, all voices play at same time. Crack the case, I think the cards should have LEDs on them and you can watch how they rotate out each note to get a better idea how it works and see if you have more slots open so can even put more in it. They can go up to 8 cards right? If you get more though, be aware you might have some trouble keeping them all in tune with each other, or they might stay tuned just fine. I've got one card in my OBSX that wasn't working when I bought it and I repaired and sometimes it is easier to just turn that one off because it likes to not sound quite the same as the other ones.

Make sure you have the upper tray for adding voices 5 thru 8. I've seen some 4-voice Xas wihout it. Where having 8 voices really makes the difference is when you are in Layer mode. You can layer 2 different patches and still have 4 note polyphony. I have some extra OB-Xa voice cards available.

Please email me at cravenskiroy@knology.net so we can contact each other. Also My battery is dead and I lost all programs. Does the replacement need to be a rechargeable? And do I need a Cassette interface or can I hook my PC directly to my keyboard via the cassette inputs on my keyboard to transfer patches by wavs?

I am not sure if this requires layering or not but he said his is 8 voice.

And lastly how would I know if I have any bad ICs. I know there is a EEProm for diagnostic tests somewhere out there because its mentioned in the service manual. Would this tell me if I had a bad Hip somewhere? I am handy with a soldiering iron and multimeter and I want to fully service this thing.

The way split and layer works is 1 patch is loaded into the lower tray cards and the other patch is loaded into the upper tray. For 6 voices you would need 3 on the lower and 3 on the upper. For those that have asked the voice cards I have are $325ea.